2 -- Table to manage users trust network
4 DROP TABLE IF EXISTS #PFX#usersnet;
5 CREATE TABLE #PFX#usersnet (
6 owner integer REFERENCES #PFX#users (code)
7 ON DELETE cascade ON UPDATE cascade, -- network owner
8 target integer REFERENCES #PFX#users (code)
9 ON DELETE cascade ON UPDATE cascade, -- evaluated user
10 friend integer, -- friendship level
11 -- 1"black", 2"unknown", 3"test", 4"friend", 5"bff"
12 skill float, -- skill level
14 ctime timestamp DEFAULT now(), -- creation time
15 mtime timestamp DEFAULT to_timestamp(0) -- modification time
18 DROP INDEX IF EXISTS #PFX#usersnet_owner_idx;
19 DROP INDEX IF EXISTS #PFX#usersnet_target_idx;
20 DROP INDEX IF EXISTS #PFX#usersnet_owner_target_idx;
22 CREATE INDEX #PFX#usersnet_owner_idx ON #PFX#usersnet (owner);
23 CREATE INDEX #PFX#usersnet_target_idx ON #PFX#usersnet (target);
24 CREATE UNIQUE INDEX #PFX#usersnet_owner_target_idx ON #PFX#usersnet (owner, target);
26 DROP VIEW #PFX#usersnet_wideskill;
27 CREATE VIEW #PFX#usersnet_wideskill
28 AS SELECT un.owner, ur.target, SUM(ur.skill * un.trust) / SUM(un.trust) as skill, count(*) as count
29 FROM #PFX#usersnet AS un, #PFX#usersnet AS ur
30 WHERE un.target = ur.owner AND un.friend >= 4 -- 'un' is, at least, our friend
31 GROUP BY un.owner, ur.target;
33 DROP VIEW #PFX#usersnet_narrowskill;
34 CREATE VIEW #PFX#usersnet_narrowskill
35 AS SELECT un.owner, ur.target, SUM(ur.skill * un.trust) / SUM(un.trust) as skill, count(*) as count
36 FROM #PFX#usersnet AS un, #PFX#usersnet AS ur -- 'un' primary records, 'ur' inheriting records
37 WHERE un.target = ur.owner AND un.friend = 5 -- 'un' is, at least, our friend
38 GROUP BY un.owner, ur.target;
40 -- DROP VIEW #PFX#usersnet_allfriends;
41 -- CREATE VIEW #PFX#usersnet_allfriends
42 -- AS SELECT un.owner, ur.target FROM #PFX#usersnet AS un, #PFX#usersnet AS ur